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Is sound under the manhole cover so that the public feel that the following people, and invited the police.

Nanjing, a manhole cover

mass terror beat sound the night

last night in Nanjing and Hong Wunan Road, White Road intersection, a strange sound Yinjing issued the following Is mine one? The crowd more and more, all the arguments it has become Xuan Hu: \What is more, said the band before the haunted, two years ago because of a lovelorn young woman jumped into the Yinjing suicide, not a ghost in it trouble you?
>>> mine was?
Yinjing the following

strange sound issue

>>> go down the search in addition to the sound of

nothing> >> Expert Secret Sound pressure air

hit a manhole cover

9:30 last night, Nanjing and Hong Wunan Road,[link widoczny dla zalogowanych], White Road intersection, an old man in a manhole cover from time to time before the walk. Squat while listening to old people, while tapping his hand manhole cover, and his move has attracted so many Ye Guiren. \Altogether a young man lying on the ground, above the ear to the manhole cover. \
\\Old man hesitated a moment, and soon mobile phone to call the police call out: \Many people can hear the sound, much like the sound of hands beating manhole cover, Yinjing the following must be someone! \/ p>
nothing

few minutes later, a police car sped to. The crowd at this time, more and more people become Xuan Hu up the discussions: \What is more, said the band before the haunted, two years ago because of a lovelorn young woman jumped into the Yinjing suicide, not a ghost in it trouble you?
for the residents of the ongoing uproar, the police side of comfort, he opened a manhole cover and found that water pipes have to climb at a time. We heart sank immediately, that water pipes must be someone. But when police open probe light conducting a search, found underground in addition to the sound of nothing.
few minutes later, there is no underground movement in the confirmation, the police covered the manhole cover. At this time tens of meters away, another Yinjing east side, a woman suddenly came the great cry: \rushed past, and she also came below the manhole cover hand tapping sound. \
police immediately cordoned off the area and once again forced open the manhole cover, the result is still nothing. Alarms that were professors at this time to speak: \Two minutes later, traffic police also rushed to the scene and transferred to a bus grinding mill manhole cover, the result is no sound.
>>> Expert Secret

air pressure sound

hit a manhole cover

we can not be opened in Yinjing when the mystery of sound, a site called the municipal police command public office telephone. After 10 minutes, Nanjing Municipal Public Utility Bureau, a specialist came to the scene. Coincidentally enough, the experts arrived on the scene, the manhole cover again with the beep. After carefully listening to the experts, a smile that he knew the reasons, this is certainly not the sound of hand percussion sound, but the sound of air pressure.
According to the experts, last night launched the municipal sector along the sewer pipe under the road white discharge operation, the sewage pumping station in the newly built large power, the old city sewer capacity is small, the sewage flow , prone to air flow, but the air pressure in the urban stream water pipes smaller, just hit a manhole cover, like the palm of your hand will be issued a beating sound.
The expert also said that installation of Hexi area are new sewage pipes, large capacity, pressure flow also very large, frequent air crash set off a manhole cover manhole cover and the phenomenon, such as recently occurred Higher Education in the west near the apartment several manhole cover away from the wellhead overnight incident, that is, the wellhead pressure flow out of the manhole cover of.
According to the Nanjing Morning Post